Abstract
Currently, studies on organic two-dimensional (2D) materials with special optic-electronic properties are attracting great research interest. However, 2D organic systems possessing promising electrical transport properties are still rare. Here a highly crystalline thin film of a copper coordination polymer, Cu-BHT (BHT=benzenehexathiol), is prepared via a liquid–liquid interface reaction between BHT/dichloromethane and copper(II) nitrate/H2O. The morphology and structure characterization reveal that this film is piled up by nanosheets of 2D lattice of [Cu3(C6S6)]n, which is further verified by quantum simulation. Four-probe measurements show that the room temperature conductivity of this material can reach up to 1,580 S cm−1, which is the highest value ever reported for coordination polymers. Meanwhile, it displays ambipolar charge transport behaviour and extremely high electron and hole mobilities (99 cm2 V−1 s−1 for holes and 116 cm2 V−1 s−1 for electrons) under field-effect modulation.
Highlights
Studies on organic two-dimensional (2D) materials with special optic-electronic properties are attracting great research interest
These thin films display highly electrical conducting behaviour from room temperature down to 2 K with conductivity up to 1,580 S cm À 1 under room temperature, which is the highest value ever reported for coordination polymers (CPs)
Thin films of Cu-BHT were prepared via an interface reaction similar to that of the preparation of the nickel–BHT complex (Ni-BHT) complex[30]
Summary
Studies on organic two-dimensional (2D) materials with special optic-electronic properties are attracting great research interest. Thin films formed by the coordination of copper(II) ion and BHT at the organic/aqueous interface were found to be composed of the nanosheets of this Cu-BHT complex. For films with thickness exceeding 200 nm, other peaks besides the (00l) series could be observed in the out-of-plane patterns, which indicate the existence of random oriented nanosheets (Supplementary Fig. 2).
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